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Toru Yajima, Yingying Yu and Masayuki Futamata Steric hindrance in cationic and neutral rhodamine 6 G molecules adsorbed on Au nanoparticles Journal of Raman Spectroscopy 44

Article first published online: 25 JAN 2013 | DOI: 10.1002/jrs.4204

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Adsorption of R6G molecules on Au nanoparticles was elucidated by surface enhanced Raman scattering. The steric hindrance at hydroethyl amino groups in R6G was evidenced by the observation that R6G+ adsorb on as-prepared gold nanoparticles (AuNPs) only with electrostatic forces in contrast to the electrostatic and chemical adsorption of R123+. It also yielded fewer saturation coverage compared to R123+. Raman bands from phenyl and ethyl substituent are specifically enhanced under an inclined orientation of R6G0 on AuNPs chemisorbed via amino groups.

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